CN113092890A - Composite monitoring and analyzing device and method based on current and temperature of power line - Google Patents
Composite monitoring and analyzing device and method based on current and temperature of power line Download PDFInfo
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- CN113092890A CN113092890A CN202110199809.1A CN202110199809A CN113092890A CN 113092890 A CN113092890 A CN 113092890A CN 202110199809 A CN202110199809 A CN 202110199809A CN 113092890 A CN113092890 A CN 113092890A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K13/00—Thermometers specially adapted for specific purposes
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S40/00—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them
- Y04S40/12—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment
- Y04S40/126—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment using wireless data transmission
Abstract
The invention discloses a composite monitoring and analyzing device and a method based on current and temperature of a power line, wherein the method comprises the following steps: step S1, analyzing and acquiring a relation model of the temperature and the current of the cable by using a trusted method; step S2, measuring three-phase current and three-phase line skin temperature by using each sensor clamped at the three-phase cable monitoring part; step S3, the sub-sensors transmit the current, temperature and cable health status data to the main sensor through the wireless module, and the main sensor calculates the low-voltage outgoing line load rate and the low-voltage outgoing line three-phase unbalance; and step S4, the main sensor determines the switch load condition and the cable health condition according to the obtained data and the calculation result, sends out alarm signals of corresponding levels according to the judgment result, and sends the alarm signals to the gateway through the concentrator in a wireless mode.
Description
Technical Field
The invention relates to the technical field of power line monitoring, in particular to a composite monitoring and analyzing device and method based on power line current and temperature.
Background
The early distribution network of China is basically formed, and most old-fashioned distribution rooms do not have the condition of power failure operation. When the intelligent transformation is carried out on a power distribution room, a very key step is to additionally install a monitoring terminal at the head side of a low-voltage outgoing cable. At present, all collected data are transmitted to a server side by the existing monitoring terminal, and all data analysis and processing are performed by the server side.
However, the existing monitoring terminal adopts a strategy to transmit data to the server for analysis and processing, and due to the time delay in data transmission from the terminal to the server, the collected data cannot be filtered and analyzed in real time, and when a large amount of data is uploaded by the terminal, a large operating pressure is brought to the server, which is not favorable for stable operation of the system.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a composite monitoring and analyzing device and a composite monitoring and analyzing method based on the current and the temperature of a power line, so that the residual computing power of a low-voltage loop measurement and control terminal is fully utilized, analysis and filtration of partial power monitoring parameters and operation of partial results are completed at the low-voltage loop measurement and control terminal, original data acquired by a wireless sensor are extracted and subjected to certain computation and then uploaded, the data quantity uploaded to a server is reduced, the computation quantity required to be borne by partial servers is shared, the purposes of saving the consumption of data bandwidth and reducing the operating pressure of a server end are achieved, finally, the charged state, the current and the temperature of a low-voltage cable are stably monitored on line in real time, a user can be helped to acquire a power supply state as early as possible, and the power supply safety is.
In order to achieve the purpose, the invention provides a composite monitoring and analyzing device based on current and temperature of a power line, which comprises a main sensor and two sub-sensors, wherein each sensor is clamped at a monitoring part of a three-phase cable respectively to acquire cable temperature, current and electrified state data of the three-phase cable respectively, each sub-sensor transmits the acquired cable temperature, current and electrified state data to the main sensor through a wireless module, and the main sensor determines the switching load condition and the cable health condition by calculating the low-voltage outgoing line load rate and the three-phase unbalance degree after collecting the acquired data of each sub-sensor and sends the determined switching load condition and the determined cable health condition to a gateway.
Preferably, each sensor is clamped at the monitoring site using a clamping mechanism, each sensor being powered by inductive electromagnetic energy around the cable or an internal battery.
In order to achieve the above object, the present invention further provides a composite monitoring and analyzing method based on the current and the temperature of the power line, comprising the following steps:
step S1, analyzing and acquiring a relation model of the temperature and the current of the cable by using a trusted method;
step S2, measuring three-phase current and three-phase line skin temperature by using each sensor clamped at the three-phase cable monitoring part;
step S3, the sub-sensors transmit the current, temperature and cable health status data to the main sensor through the wireless module, and the main sensor calculates the low-voltage outgoing line load rate and the low-voltage outgoing line three-phase unbalance;
and step S4, the main sensor determines the switch load condition and the cable health condition according to the obtained data and the calculation result, sends out alarm signals of corresponding levels according to the judgment result, and sends the alarm signals to the gateway through the concentrator in a wireless mode.
Preferably, after step S2, the method further includes the following steps:
and judging whether the current and the temperature measured value obtained in the step S2 conform to the temperature and current relation model through each sensor, and judging whether the current cable is in a healthy state according to the judgment result.
Preferably, the three-phase current values measured in step S2 are substituted into the temperature and current relationship model to obtain corresponding temperature calculation values, respectively, and an error between the temperature calculation value and the corresponding temperature measurement value is calculated, where if the error value is within a preset threshold, it indicates that the corresponding cable is in a healthy state.
Preferably, in step S1, a relationship model between the temperature and the current of the cable is obtained by sampling and analyzing the current value and the skin temperature value of the selected low-voltage outgoing switch lines of some power distribution rooms by using other trusted methods.
Preferably, in step S3, the load ratio of the low-voltage outgoing line and the degree of unbalance between the three phases of the low-voltage outgoing line are calculated as follows:
the load factor of the low-voltage outgoing line is equal to the maximum single-phase current of the line/rated current of the switch by 100 percent,
the unbalance degree of three phases of the low-voltage outgoing line is (maximum current in the three phases-minimum current in the three phases)/maximum current in the three phases is 100%.
Preferably, in step S4, the main sensor determines whether the cross-sectional values of four consecutive minutes satisfy a preset alarm level, and if so, sends an alarm signal of a corresponding level, and simultaneously sends the measurement data and the alarm information to the gateway through the concentrator in a wireless manner.
Preferably, after step S4, the method further includes the following steps:
the gateway informs the relevant executing mechanism to adjust after applying the north direction to the received measurement data and the alarm information.
Preferably, in step S4, the main sensor determines whether the current cable is in a healthy state according to the determination result by determining whether the current and the temperature measured in step S2 conform to the temperature and current relationship model.
Compared with the prior art, the composite monitoring and analyzing device and method based on the current and the temperature of the power line fully utilize the residual computing power of the low-voltage loop measurement and control terminal, complete analysis and filtration of partial power monitoring parameters and operation of partial results at the low-voltage loop measurement and control terminal, upload the original data acquired by the wireless sensor after extraction and certain computation, reduce the data volume uploaded to the server, share the computation required to be born by partial servers, achieve the purposes of saving the consumption of data bandwidth and reducing the operating pressure of a server, finally realize real-time and stable online monitoring of the charged state, the current and the temperature of the low-voltage cable, help users to acquire the power supply state as soon as possible, and ensure the power supply safety.
Drawings
FIG. 1 is a system architecture diagram of a combined monitoring and analyzing device based on power line current and temperature according to the present invention;
FIG. 2 is a schematic diagram of interaction among monitoring terminals in an embodiment of the present invention;
FIG. 3 is a flow chart illustrating the steps of a method for monitoring and analyzing power line current and temperature in accordance with the present invention;
FIG. 4 is a flow chart of an embodiment of the present invention;
FIG. 5 is a fitting graph of a current temperature relationship model in an embodiment of the present invention.
Detailed Description
Other advantages and capabilities of the present invention will be readily apparent to those skilled in the art from the present disclosure by describing the embodiments of the present invention with specific embodiments thereof in conjunction with the accompanying drawings. The invention is capable of other and different embodiments and its several details are capable of modification in various other respects, all without departing from the spirit and scope of the present invention.
Fig. 1 is a system architecture diagram of a composite monitoring and analyzing device based on power line current and temperature according to the present invention. As shown in fig. 1, the composite monitoring and analyzing device based on the current and temperature of the power line of the present invention includes a main sensor 10 and two sub-sensors 20, each sensor is clamped at the monitoring position of a three-phase cable by a clamping mechanism to collect data of the temperature, current, and charged state of the three-phase cable, respectively, a high performance single chip microcomputer is provided in each sensor, and wireless modules are provided to communicate with each other, the sub-sensors 20 transmit the collected data of the temperature, current, and charged state of the cable to the main sensor 10 through the wireless modules, the main sensor 10 calculates the switching load condition and the cable health condition by calculating the low voltage outgoing line load rate, the three-phase imbalance, and the like after collecting the collected data of the sub-sensors 20, and sends the calculated switching load condition and the calculated cable health condition to a gateway through a communication concentrator.
In the invention, each sensor is a low-voltage loop measurement and control terminal, is a multifunctional wireless sensor applied to low voltage 400V, and is clamped at the monitoring part of a three-phase cable by adopting a clamping mechanism as shown in figure 2, namely an A-phase monitoring terminal, a B-phase monitoring terminal and a C-phase monitoring terminal, the temperature sensor of each monitoring terminal is tightly attached to the cable, each monitoring terminal adopts double power supplies to obtain electricity, and can supply power by induction electromagnetic energy around the cable or an internal battery without an external power supply.
Fig. 3 is a flowchart illustrating steps of a composite monitoring and analyzing method based on current and temperature of a power line according to an embodiment of the present invention, and fig. 4 is a flowchart illustrating an embodiment of the present invention. As shown in fig. 3 and 4, the composite monitoring and analyzing method based on the current and the temperature of the power line of the present invention includes the following steps:
and step S1, acquiring a relation model of the temperature T and the current I by measuring the current I and the temperature T in a large quantity.
Specifically, after sampling and analyzing the current value and the skin temperature value of the selected low-voltage outgoing switch lines of some power distribution rooms by using other credible methods, the conclusion that the skin temperature and the current of each group of switch cables have strong correlation and the reliability of the quadratic regression equation is high is obtained, as shown in fig. 5, so that a relational model of the following recursive formula is obtained:
T＝38.65-0.01344×I+0.000197×I2
therefore, it is considered that the cable temperature can be predicted by the regression equation and the current value, and the predicted temperature is compared with the actual temperature, thereby judging the switch load condition and the cable health condition.
Step S2, measuring three-phase current I by using each sensorA,IB,ICAnd three phase line skin temperature TA,TB,TC。
And step S3, calculating whether the measured current and temperature values obtained by measurement accord with the model through the three-phase sensor, and judging whether the cable is in a healthy state according to the judgment result.
In an embodiment of the present invention, the obtained current values of the three phases may be substituted into the relationship model to obtain corresponding calculated temperature values, respectively, and an error between the calculated temperature value and the corresponding measured temperature value is calculated, where an error value within a preset threshold (e.g., 10%) indicates that the cable is in a healthy state. However, it should be noted that the determination of the health status of each phase cable may be determined by the corresponding sensor itself, or may be transmitted to the main sensor for determination, and the present invention is not limited thereto.
And step S4, the sub-sensors transmit data such as current, temperature, cable health state and the like to the main sensor through the wireless module, and the main sensor calculates the low-voltage outgoing line load rate and the three-phase unbalance degree.
In the embodiment of the invention, the load rate of the low-voltage outgoing line and the three-phase unbalance are obtained according to the following formulas:
the load factor of the low-voltage outgoing line is equal to the maximum single-phase current of the line/rated current of the switch by 100 percent,
the unbalance degree of three phases of the low-voltage outgoing line is (maximum current in the three phases-minimum current in the three phases)/maximum current in the three phases is 100%.
And step S5, the main sensor determines the switch load condition and the cable health condition according to the calculated low-voltage outgoing line load rate and the three-phase unbalance degree, sends out an alarm signal of a corresponding grade according to the judgment result, and sends the alarm signal to the gateway through the concentrator in a wireless mode.
In the embodiment of the present invention, the main sensor determines whether four consecutive 15-minute section values (under a certain ground state current, if the directions of active power currents in the power system are completely consistent, and the power transmission lines with basically similar distances between different electric devices are also called power transmission sections, for example, a power transmission section can be calculated by three-phase four lines with the same distance after a certain switch) satisfy the following condition in table 1, and if so, sends out an alarm signal of a corresponding level, and simultaneously sends the alarm signal to the gateway through the concentrator in a wireless manner.
TABLE 1
The gateway Northbound Interface (Interface provided upward for the manufacturer or the operator to access and manage the network) application notifies the relevant execution mechanism to adjust through the received measurement data and the alarm message information, and reminds the dispatching personnel to overhaul or cut off the relevant loop to ensure the healthy operation of the power grid when the automatic execution mechanism can not solve the problem.
Therefore, the method and the device can solve the problems of overlarge calculated amount and data amount in the server, can quickly and accurately calculate the three-phase imbalance degree, analyze the running state of the system, quickly position the fault of the power system and improve the power supply reliability.
The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Modifications and variations can be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the present invention. Therefore, the scope of the invention should be determined from the following claims.
Claims (10)
1. The utility model provides a compound monitoring analytical equipment based on power line electric current and temperature, includes a main sensor and two sub-sensors, and each sensor centre gripping is at the monitoring position of three-phase cable respectively to gather the cable temperature, electric current, the electrified state data of three-phase cable respectively, each sub-sensor passes through cable temperature, electric current, the electrified state data transmission who gathers to the main sensor, the main sensor is after collecting the data collection of each sub-sensor, through calculating low pressure load rate of being qualified for the next round of competitions, the low pressure three-phase unbalance degree of being qualified for the next round of competitions confirms switch load condition and cable health condition, and sends the switch load condition and the cable health condition of confirming to the gateway.
2. The composite monitoring and analyzing device based on the current and the temperature of the power line as claimed in claim 1, wherein each sensor is clamped at the monitoring position by a clamping mechanism, and each sensor is powered by the induced electromagnetic energy around the cable or an internal battery.
3. A composite monitoring and analyzing method based on the current and the temperature of a power line comprises the following steps:
step S1, analyzing and acquiring a relation model of the temperature and the current of the cable by using a trusted method;
step S2, measuring three-phase current and three-phase line skin temperature by using each sensor clamped at the three-phase cable monitoring part;
step S3, the sub-sensors transmit the current, temperature and cable health status data to the main sensor through the wireless module, and the main sensor calculates the low-voltage outgoing line load rate and the low-voltage outgoing line three-phase unbalance;
and step S4, the main sensor determines the switch load condition and the cable health condition according to the obtained data and the calculation result, sends out alarm signals of corresponding levels according to the judgment result, and sends the alarm signals to the gateway through the concentrator in a wireless mode.
4. The composite monitoring and analyzing method based on the current and the temperature of the power line as claimed in claim 3, further comprising the following steps after step S2:
and judging whether the current and the temperature measured value obtained in the step S2 conform to the temperature and current relation model through each sensor, and judging whether the current cable is in a healthy state according to the judgment result.
5. The composite monitoring and analyzing method based on the current and the temperature of the power line as claimed in claim 4, wherein: and substituting the current values of the three phases measured in the step S2 into the temperature and current relation model to respectively obtain corresponding temperature calculation values, calculating the error between the temperature calculation values and the corresponding temperature measurement values, and if the error value is within a preset threshold value, indicating that the corresponding cable is in a healthy state.
6. The composite monitoring and analyzing method based on the current and the temperature of the power line as claimed in claim 5, wherein: in step S1, a relationship model between the temperature and the current of the cable is obtained by sampling and analyzing the current value and the skin temperature value of the selected low-voltage outgoing switch lines of some power distribution rooms by using other credible methods.
7. The composite monitoring and analyzing method of claim 6, wherein in step S3, the load ratio of the low-voltage outgoing line and the unbalance degree between the three phases of the low-voltage outgoing line are calculated as follows:
the load factor of the low-voltage outgoing line is equal to the maximum single-phase current of the line/rated current of the switch by 100 percent,
the unbalance degree of three phases of the low-voltage outgoing line is (maximum current in the three phases-minimum current in the three phases)/maximum current in the three phases is 100%.
8. A composite monitoring and analysis method based on power line current and temperature according to claim 7, characterized in that: in step S4, the main sensor determines whether the cross-sectional values of four consecutive minutes satisfy a preset alarm level, and if so, sends an alarm signal of a corresponding level, and simultaneously sends the measurement data and the alarm information to the gateway through the concentrator in a wireless manner.
9. The composite monitoring and analyzing method based on the current and the temperature of the power line as claimed in claim 8, further comprising the following steps after step S4:
the gateway informs the relevant executing mechanism to adjust after applying the north direction to the received measurement data and the alarm information.
10. A composite monitoring and analysis method based on power line current and temperature according to claim 3, characterized in that: in step S4, the main sensor determines whether the current cable is in a healthy state according to the determination result by determining whether the current and temperature measurement values obtained in step S2 conform to the temperature and current relationship model.
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